OOIR: Observatory of International Research

Papers

(The median citation count of Investigative Radiology is 5. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-04-01 to 2025-04-01.)

Article	Citations
Intraindividual Comparison of Image Quality Between Low-Dose and Ultra-Low-Dose Abdominal CT With Deep Learning Reconstruction and Standard-Dose Abdominal CT Using Dual-Split Scan	117
Automated Detection, Segmentation, and Classification of Pleural Effusion From Computed Tomography Scans Using Machine Learning	114
Fully Automatic Deep Learning in Bi-institutional Prostate Magnetic Resonance Imaging	86
Feature Robustness and Diagnostic Capabilities of Convolutional Neural Networks Against Radiomics Features in Computed Tomography Imaging	81
A Pilot Study of Multidimensional Diffusion MRI for Assessment of Tissue Heterogeneity in Prostate Cancer	71
From Dose Reduction to Contrast Maximization	71
Improving the Safety of Computed Tomography Through Automated Quality Measurement	68
Computed Tomography	64
7 T Lesion-Attenuated Magnetization-Prepared Gradient Echo Acquisition for Detection of Posterior Fossa Demyelinating Lesions in Multiple Sclerosis	58
Three-Dimensional Magnetic Resonance Fingerprinting in Neonates	58
Ultra-High b-Value Diffusion-Weighted Imaging-Based Abbreviated Protocols for Breast Cancer Detection	55
Inductively Coupled Intraoral Flexible Coil for Increased Visibility of Dental Root Canals in Magnetic Resonance Imaging	50
Deep Learning-Based Automatic Detection and Grading of Motion-Related Artifacts on Gadoxetic Acid-Enhanced Liver MRI	49
Contrast-Enhanced 3D Spin Echo T1-Weighted Sequence Outperforms 3D Gradient Echo T1-Weighted Sequence for the Detection of Multiple Sclerosis Lesions on 3.0 T Brain MRI	47
Visualization of Renal Glomeruli in Human Native Kidneys With Sensing Ultrasound Localization Microscopy	47
Subcutaneous and Visceral Adipose Tissue Reference Values From the Framingham Heart Study Thoracic and Abdominal CT	44
Fast Quantitative Low-Field Magnetic Resonance Imaging With OPTIMUM—Optimized Magnetic Resonance Fingerprinting Using a Stationary Steady-State Cartesian Approach and Accelerated Acquisition Schedules	44
ADAMTS4-Specific MR Peptide Probe for the Assessment of Atherosclerotic Plaque Burden in a Mouse Model	43
New Horizons in Vascular Imaging With Photon-Counting Detector CT	42
Deep Learning-Enhanced Parallel Imaging and Simultaneous Multislice Acceleration Reconstruction in Knee MRI	41
Accurate Diagnosis of Cortical and Infratentorial Lesions in Multiple Sclerosis Using Accelerated Fluid and White Matter Suppression Imaging	41
Artificial T1-Weighted Postcontrast Brain MRI	39
Personalized Chest Computed Tomography	39
Muscle Reference Values From Thoracic and Abdominal CT for Sarcopenia Assessment	39
Toward Precision Diagnosis	38

Countering Calcium Blooming With Personalized Contrast Media Injection Protocols	38
AI-Based Measurement of Lumbar Spinal Stenosis on MRI	35
Performance of an Intravascular Tantalum Oxide–Based Nanoparticle Computed Tomography Contrast Agent in Preclinical Hepatic Tumor Detection	35
Deep Learning Reconstruction of Prospectively Accelerated MRI of the Pancreas	34
Emerging Trends and Innovations in Radiologic Diagnosis of Thoracic Diseases	34
CT- and MRI-Aided Fluorescence Tomography Reconstructions for Biodistribution Analysis	33
Metabolic MRI With Hyperpolarized 13C-Pyruvate for Early Detection of Fibrogenic Kidney Metabolism	33
Intraindividual Comparison of Compressed Sensing‐Accelerated Cartesian and Radial Arterial Phase Imaging of the Liver in an Experimental Tumor Model	32
Feasibility and Implementation of a 4D Free-Breathing Variable Density Stack-of-Stars Functional Magnetic Resonance Urography in Young Children Without Sedation	32
Implementing Artificial Intelligence for Emergency Radiology Impacts Physicians' Knowledge and Perception	31
MRI of Temporomandibular Joint Disorders: A Comparative Study of 0.55 T and 1.5 T MRI	31
Pseudoprospective Paraclinical Interaction of Radiology Residents With a Deep Learning System for Prostate Cancer Detection	31
Physics-Informed Discretization for Reproducible and Robust Radiomic Feature Extraction Using Quantitative MRI	30
Deep Learning-Based Image Conversion Improves the Reproducibility of Computed Tomography Radiomics Features	29
Extended Intraoperative Longitudinal 3-Dimensional Cone Beam Computed Tomography Imaging With a Continuous Multi-Turn Reverse Helical Scan	28
Next-Generation Cancer Magnetic Resonance Imaging With Tumor-Targeted Alkylphosphocholine Metal Analogs	28
Assessing the Sensitivity of Dual-Energy Computed Tomography 3-Material Decomposition for the Detection of Gout	28
Clinical Utility of Diffusion-Weighted Imaging in Gynecological Imaging	28
Artificial Intelligence to Assess Tracheal Tubes and Central Venous Catheters in Chest Radiographs Using an Algorithmic Approach With Adjustable Positioning Definitions	27
Multiparametric Cardiovascular MRI Assessment of Post-COVID Syndrome in Children in Comparison to Matched Healthy Individuals	27
Subnodal Correspondence of PSMA Expression and USPIO-MRI in Metastatic Pelvic Lymph Nodes in Prostate Cancer	27
Automated Pathology Detection and Patient Triage in Routinely Acquired Head Computed Tomography Scans	26
Dynamic Liver Magnetic Resonance Imaging During Free Breathing	26
High-Accuracy Nodal Staging of Head and Neck Cancer With USPIO-Enhanced MRI	25
Whole-Body Magnetic Resonance Imaging in the Large Population-Based German National Cohort Study	25
Gadolinium Deposition Disease	25
High-Resolution Free-Breathing Chemical-Shift-Encoded MRI for Characterizing Lymph Nodes in the Upper Abdomen	24
Artifact Reduction in Interventional Devices Using Virtual Monoenergetic Images and Iterative Metal Artifact Reduction on Photon-Counting Detector CT	24
Novel Clinically Translatable Iron Oxide Nanoparticle for Monitoring Anti-CD47 Cancer Immunotherapy	23
Reduction of Gadolinium-Based Contrast Agents in MRI Using Convolutional Neural Networks and Different Input Protocols	23
Quantitative Liver Imaging in Children	22
First In-Human Results of Computed Tomography Angiography for Coronary Stent Assessment With a Spectral Photon Counting Computed Tomography	22
Current Status of Magnetic Resonance Imaging Use in Bladder Cancer	22
Contrast-Enhanced Digital Breast Tomosynthesis Compared With Contrast-Enhanced Mammography and Magnetic Resonance Imaging in the Assessment of Breast Lesions	22
Pancreatic Intraepithelial Neoplasia Revealed by Diffusion-Tensor MRI	21
ComBat Harmonization for MRI Radiomics	21
Investigating the Small Pixel Effect in Ultra-High Resolution Photon-Counting CT of the Lung	21
Addressing the Contrast Media Recognition Challenge	21
Advanced Neuroimaging With Photon-Counting Detector CT	21
Impact of Vasodilation on Oxygen-Enhanced Functional Lung MRI at 0.55 T	20
The Glymphatic System in Humans: Investigations With Magnetic Resonance Imaging	20
Metal Artifact Reduction in Photon-Counting Detector CT	20
Third-Generation Cardiovascular Phantom	20
Influence of Contrast Media Temperature and Concentration on Patient Comfort and Safety in Computed Tomography	19
Pharmacokinetics, Safety, and Tolerability of the Novel Tetrameric, High-Relaxivity, Macrocyclic Gadolinium-Based Contrast Agent Gadoquatrane in Healthy Adults	19
Gadopiclenol: A q = 2 Gadolinium-Based MRI Contrast Agent Combining High Stability and Efficacy	19
Recent Developments and Future Perspectives in Magnetic Resonance Imaging and Computed Tomography Contrast Media	19
Improved Brain Tumor Conspicuity at 3 T Using Dark Blood, Fat-Suppressed, Dixon Unbalanced T1 Relaxation-Enhanced Steady-State MRI	18
A New Algorithm for Automatically Calculating Noise, Spatial Resolution, and Contrast Image Quality Metrics	18
Assessment of Emphysema on X-ray Equivalent Dose Photon-Counting Detector CT	18

Serum and Urine Gadolinium Reference Intervals in Patients With Normal Renal Function Following Gadobutrol Administration	18
Photon-Counting Computed Tomography for Coronary Stent Imaging	18
Photon-Counting Versus Energy-Integrating Detector CT Angiography of the Lower Extremity in a Human Cadaveric Model With Continuous Extracorporeal Perfusion	17
Quantitative Magnetic Resonance Imaging for the Pancreas	17
Low-Field MRI for Dental Imaging in Pediatric Patients With Supernumerary and Ectopic Teeth	17
Sexual Dimorphism of Radiomic Features in the Brain	17
MR Safety of Inductively Coupled and Conventional Intraoral Coils	17
Significance of Image Reconstruction Parameters for Future Lung Cancer Risk Prediction Using Low-Dose Chest Computed Tomography and the Open-Access Sybil Algorithm	17
MR Lymphangiography	17
Relaxivity and In Vivo Human Performance of Brand Name Versus Generic Ferumoxytol	17
Artificial Intelligence to Reduce or Eliminate the Need for Gadolinium-Based Contrast Agents in Brain and Cardiac MRI	16
A Real-World Clinical Implementation of Automated Processing Using Intelligent Work Aid for Rapid Reformation at the Orbitomeatal Line in Head Computed Tomography	16
Clinical Efficacy of Gadobutrol: Review of Over 25 Years of Use Exceeding 100 Million Administrations	16
Impact of the Novel MRI Contrast Agent Gadopiclenol on Radiotherapy Decision Making in Patients With Brain Metastases	16
Myocardial Tissue Oxygenation and Microvascular Blood Volume Measurement Using a Contrast Blood Oxygenation Level–Dependent Imaging Model	16
Image Quality of High-Resolution 3-Dimensional Neck MRI Using CAIPIRINHA-VIBE and GRASP-VIBE	16
Audiovisual Breathing Guidance for Improved Image Quality and Scan Efficiency of T2- and Diffusion-Weighted Liver MRI	16
A Multiclass Radiomics Method–Based WHO Severity Scale for Improving COVID-19 Patient Assessment and Disease Characterization From CT Scans	16
Diagnostic Performance of 9 Quantitative Ultrasound Parameters for Detection and Classification of Hepatic Steatosis in Nonalcoholic Fatty Liver Disease	15
In Vivo Validation of Modulated Acoustic Radiation Force–Based Imaging in Murine Model of Abdominal Aortic Aneurysm Using VEGFR-2–Targeted Microbubbles	15
Photon-Counting Detector CT Angiography for Endoleak Detection After Endovascular Aortic Repair	15
Peripheral Nerve Involvement at First Diagnosis of Multiple Sclerosis	15
Safety and Gadolinium Distribution of the New High-Relaxivity Gadolinium Chelate Gadopiclenol in a Rat Model of Severe Renal Failure	15
Qualitative and Quantitative Analysis of a Spiral Gradient Echo Sequence for Contrast-Enhanced Fat-Suppressed T1-Weighted Spine Magnetic Resonance Imaging	15
Highly Sensitive 3-Tesla Real Inversion Recovery MRI Detects Leptomeningeal Contrast Enhancement in Chronic Active Multiple Sclerosis	15
High-Resolution Single Tooth MRI With an Inductively Coupled Intraoral Coil—Can MRI Compete With CBCT?	15
Evaluation of the Diagnostic Performance of Positron Emission Tomography/Magnetic Resonance for the Diagnosis of Liver Metastases	14
Multiarterial Phase Acquisition in Gadoxetic Acid–Enhanced Liver MRI for the Detection of Hypervascular Hepatocellular Carcinoma in High-Risk Patients	14
Dark-Field Chest Radiography Outperforms Conventional Chest Radiography for the Diagnosis and Staging of Pulmonary Emphysema	14
Artificial Intelligence and Interstitial Lung Disease: Diagnosis and Prognosis	14
Repeatability and Reproducibility of ADC Measurements and MRI Signal Intensity Measurements of Bone Marrow in Monoclonal Plasma Cell Disorders	14
Shaken or Stirred? The Inconsistencies of Manual Contrast Media Dilution in Endovascular Interventions	12
De Novo Radiomics Approach Using Image Augmentation and Features From T1 Mapping to Predict Gleason Scores in Prostate Cancer	12
The Compressed Sensing MP2RAGE as a Surrogate to the MPRAGE for Neuroimaging at 3 T	12
Multimodal In Vivo Tracking of Chimeric Antigen Receptor T Cells in Preclinical Glioblastoma Models	12
Glutathione in the Pons Is Associated With Clinical Status Improvements in Subacute Spinal Cord Injury	12
Semiquantitative 3T Brain Magnetic Resonance Imaging for Dynamic Visualization of the Glymphatic-Lymphatic Fluid Transport System in Humans	12
Transient Severe Motion Artifact on Arterial Phase in Gadoxetic Acid-Enhanced Liver Magnetic Resonance Imaging	12
Risk of Contrast-Induced Acute Kidney Injury in Computed Tomography	11
Hot Topics in Diagnostic Imaging—Encompassing Advances in MR, Photon-Counting CT, and Ultrasound	11
Comparison of Iron(III)-Trans-1,4-Diaminocyclohexane-tCDTA and Iron(III)-Trans-1,4-Diaminocyclohexane-tCDTA-Dimer With Gadobutrol for T1 Contrast Enhancement in DCE-MRI	11
A Comprehensive Overview of the Efficacy and Safety of Gadopiclenol: A New Contrast Agent for MRI of the CNS and Body	11
Gadolinium Elimination in a Gadolinium Deposition Disease Population After a Single Exposure to Gadolinium-Based Contrast Agents	11
Deep Learning–Based Signal Amplification of T1-Weighted Single-Dose Images Improves Metastasis Detection in Brain MRI	11
Real-Time Deformability Cytometry Detects Leukocyte Stiffening After Gadolinium-Based Contrast Agent Exposure	11
A New Era in Magnetic Resonance Contrast Media	11
Improved MR Detection of Optic Nerve Demyelination With MP2RAGE-FLAWS Compared With T2-Weighted Fat-Saturated Sequences	11
First-in-Human Safety, Tolerability, Efficacy, and Pharmacokinetics of Pegfosimer Manganese (SN132D) for Contrast-Enhanced MRI of Breast Cancer	11
Deep Learning Reconstruction Combined With Conventional Acceleration Improves Image Quality of 3 T Brain MRI and Does Not Impact Quantitative Diffusion Metrics	11
Image Quality and Detection of Small Focal Liver Lesions in Diffusion-Weighted Imaging	11
Evaluating Undersampling Schemes and Deep Learning Reconstructions for High-Resolution 3D Double Echo Steady State Knee Imaging at 7 T: A Comparison Between GRAPPA, CAIPIRINHA, and Compressed Sensing	11
Risk of Hypersensitivity Reactions to Iopromide in Children and Elderly	10
Impact of Contrast Enhancement and Virtual Monoenergetic Image Energy Levels on Emphysema Quantification	10
Optimized, Person-Centered Workflow Design for a High-Throughput Breast MRI Screening Facility—A Simulation Study	10
Focused Ultrasound	10
Pharmacokinetics and Tolerability of the Cancer-Targeting MRI Contrast Agent MT218 in Healthy Males	10
Pressure Measurement in a Bladder Phantom Using Contrast-Enhanced Ultrasonography—A Path to a Catheter-Free Voiding Cystometrogram	10
Photon-Counting Detector CT With Quantum Iterative Reconstruction	9
Noninvasive 3-Dimensional 1H-Magnetic Resonance Spectroscopic Imaging of Human Brain Glucose and Neurotransmitter Metabolism Using Deuterium Labeling at 3T	9
Protein MRI Contrast Agents as an Effective Approach for Precision Molecular Imaging	9
First Experience With a Whole-Body Spectral Photon-Counting CT Clinical Prototype	9
Dual-Contrast Biphasic Liver Imaging With Iodine and Gadolinium Using Photon-Counting Detector Computed Tomography	9
A New Iterative Metal Artifact Reduction Algorithm for Both Energy-Integrating and Photon-Counting CT Systems	9
Machine Learning–Based Perivascular Space Volumetry in Alzheimer Disease	9
Ultra-High-Resolution Coronary CT Angiography With Photon-Counting Detector CT	9
Fat Quantification in Dual-Layer Detector Spectral Computed Tomography	9
Time-of-Flight Angiography in Ultra-High-Field 7 T MRI for the Evaluation of Peroneal Perforator Arteries Before Osseomyocutaneous Flap Surgery	9
T2 Turbo Spin Echo With Compressed Sensing and Propeller Acquisition (Sampling k-Space by Utilizing Rotating Blades) for Fast and Motion Robust Prostate MRI	9
Ultra-High-Resolution and K-Edge Imaging of Prosthetic Heart Valves With Spectral Photon-Counting CT	9
A Novel Reconstruction Technique to Reduce Stair-Step Artifacts in Sequential Mode Coronary CT Angiography	9
Ultra-Low-Dose Photon-Counting CT Imaging of the Paranasal Sinus With Tin Prefiltration	9
Deep Learning-Based Superresolution Reconstruction for Upper Abdominal Magnetic Resonance Imaging	9
Inflammatory Knee Synovitis	9
MRI of Potassium and Sodium Enables Comprehensive Analysis of Ion Perturbations in Skeletal Muscle Tissue After Eccentric Exercise	9
Universal 120-kV Dual-Source Ultra-High Pitch Protocol on the Photon-Counting CT System for Pediatric Abdomen of All Sizes: A Phantom Investigation Comparing With Energy-Integrating CT	9
Scientific Advances, Investigative Radiology 2020 (and Beyond)	8
Magnetic Resonance Fingerprinting	8
Differentiating Macrovascular and Microvascular Ischemia Using Fractal Analysis of Dynamic Myocardial Perfusion Stress-CT	8
Modern Low-Field MRI of the Musculoskeletal System	8
Low-Dose CT Imaging of the Pelvis in Follow-up Examinations—Significant Dose Reduction and Impact of Tin Filtration	8

Breast Computed Tomography	8
Breast DWI Analyzed Before and After Gadolinium Contrast Administration—An Intrapatient Analysis on 1.5 T and 3.0 T	8
Delayed Gadolinium Leakage in Ocular Structures	8
Evaluation of Iterative Denoising 3-Dimensional T2-Weighted Turbo Spin Echo for the Diagnosis of Deep Infiltrating Endometriosis	8
Assessment of Fat Fractions in the Tongue, Soft Palate, Pharyngeal Wall, and Parapharyngeal Fat Pad by the GOOSE and DIXON Methods	8
Diagnostic Performance of 0.55 T MRI for Intracranial Aneurysm Detection	8
Magnetic Resonance Water Tracer Imaging Using 17O-Labeled Water	8
Quantification of Hepatocellular Carcinoma Vascular Dynamics With Contrast-Enhanced Ultrasound for LI-RADS Implementation	8
Influence of Image Processing on Radiomic Features From Magnetic Resonance Imaging	8
Realistic Kidney Tissue Surrogates for Multienergy Computed Tomography—Feasibility and Estimation of Energy-Dependent Attenuation Thresholds for Renal Lesion Enhancement in Low-kV and Virtual Monoener	8
Hip Imaging in Children With Cerebral Palsy	8
Benchmarking Feature Selection Methods in Radiomics	7
Image Quality Assessment for Clinical Cadmium Telluride-Based Photon-Counting Computed Tomography Detector in Cadaveric Wrist Imaging	7
In Vivo Repeatability and Multiscanner Reproducibility of MRI Radiomics Features in Patients With Monoclonal Plasma Cell Disorders	7
Association of Cerebral Blood Flow and Brain Tissue Relaxation Time With Neurodevelopmental Outcomes of Preterm Neonates	7
Effect of Reconstruction Kernel and Virtual Monoenergetic Imaging on Segmentation-Based Measurement of Coronary Plaque Volume With Photon-Counting CT	7
7 T Musculoskeletal MRI	7
Reliable Assessment of Swine Renal Fibrosis Using Quantitative Magnetization Transfer Imaging	7
Elemental Bioimaging of Sheep Bone and Articular Cartilage After Single Application of Gadolinium-Based Contrast Agents	7
Small Brain Lesion Enhancement and Gadolinium Deposition in the Rat Brain	7
Thermoluminescence Dosimetry in Abdominal CT for Urinary Stone Detection	7
Automatic Detection of Pancreatic Lesions and Main Pancreatic Duct Dilatation on Portal Venous CT Scans Using Deep Learning	7
Simultaneous Multislice Accelerated TSE for Improved Spatiotemporal Resolution and Diagnostic Accuracy in Magnetic Resonance Neurography	7
Influence of Residual Quadrupolar Interaction on Quantitative Sodium Brain Magnetic Resonance Imaging of Patients With Multiple Sclerosis	7
Liquid-Liver Phantom	6
Lung Magnetic Resonance Imaging	6
Moving Beyond CT Body Composition Analysis	6
The Importance of Temporal Resolution for Ultra-High-Resolution Coronary Angiography	6
Gadopiclenol Enables Reduced Gadolinium Dose While Maintaining Quality of Pulmonary Arterial Enhancement for Pulmonary MRA	6
How Does Target Lesion Selection Affect RECIST? A Computer Simulation Study	6
Ultra-High-Resolution Photon-Counting CT Imaging of the Chest	6
1.5 vs 3 Tesla Magnetic Resonance Imaging	6
Spectral shaping via tin prefiltration in ultra-high-resolution photon-counting and energy-integrating detector CT of the temporal bone: Erratum	6
Photon Counting Detector CT-Based Virtual Noniodine Reconstruction Algorithm for In Vitro and In Vivo Coronary Artery Calcium Scoring: Impact of Virtual Monoenergetic and Quantum Iterative Reconstruct	6
Molecular Ultrasound Imaging With Clinically Translatable cRGD-Coated Microbubbles to Assess αvβ3-Integrin Expression in Inflammatory Bowel Disease	6
Free-Breathing High-Resolution, Swap-Free, and Motion-Corrected Water/Fat Separation in Pediatric Abdominal MRI	6
Repeated Contrast-Enhanced Micro-CT Examinations Decrease Animal Welfare and Influence Tumor Physiology	6
MR Elastography in Cancer	6
A Deep Learning Approach to Predicting Disease Progression in Multiple Sclerosis Using Magnetic Resonance Imaging	6
CT Quantification of Interstitial Lung Abnormality and Interstitial Lung Disease: From Technical Challenges to Future Directions	6
Skin Toxicity After Exposure to Gadolinium-Based Contrast Agents in Normal Renal Function, Using Clinical Approved Doses	6
Differentiation of Atherosclerotic Carotid Plaque Components With Dual-Energy Computed Tomography	6
Detectability of Breast Cancer in Dedicated Breast CT Compared With Mammography Dependent on Breast Density	6
Deep Learning Synthesis of White-Blood From Dark-Blood Late Gadolinium Enhancement Cardiac Magnetic Resonance	6
Technical Basics and Clinical Benefits of Photon-Counting CT	6
Motion-Compensated Multishot Pancreatic Diffusion-Weighted Imaging With Deep Learning–Based Denoising	5
Epineural Scarring Visualization and Noninvasive Quantification of a Severe Posttraumatic Complication	5
Lung Nodule Detection With Modern Low-Field MRI (0.55 T) in Comparison to CT	5
Ultra-High-Field 7 T Magnetic Resonance Imaging Including Dynamic and Static Contrast-Enhanced T1-Weighted Imaging Improves Detection of Secreting Pituitary Microadenomas	5
Metastasis Detection Using True and Artificial T1-Weighted Postcontrast Images in Brain MRI	5
Accuracy of Nodule Volume and Airway Wall Thickness Measurement Using Low-Dose Chest CT on a Photon-Counting Detector CT Scanner	5
Deep Learning Diagnosis and Classification of Rotator Cuff Tears on Shoulder MRI	5
Leveraging Phase Information of 3D Isotropic Ultrashort Echo Time Pulmonary MRI for the Detection of Thoracic Lymphadenopathy	5
Influence of Reader Expertise on Myocardial Infarction Detection	5
Magnetic Resonance Elastography (MRE) of Bleomycin-Induced Pulmonary Fibrosis in an Animal Model	5
First Performance Evaluation of an Artificial Intelligence-Based Computer-Aided Detection System for Pulmonary Nodule Evaluation in Dual-Source Photon-Counting Detector CT at Different Low-Dose Levels	5